All the generators work on a principle of dynamically induced e.m.f. This principle is nothing but the Farady's law of electromagnetic induction. It states that, 'Whenever the number of magnetic lines of force i.e. flux linking with a conductor or a coil changes, an electromotive force is set up in that conductor or coil.' The change in flux associated with the conductor can exist only when there exists a relative motion between a conductor and the flux. The relative motion can be achieved by rotating conductor whith respect to flux or by rotating flux whith respect to a conductor. So a voltage gets generated in a conductor, as long as there exist a relative motin between conductor and the flux.
Such an induced e.m.f. which id due to physical movement of coil or conductor with respect to flux or movement of flux with respect to coil or conductor is called dynamically induced e.m.f.
Key Point : So a generating action requires following basic component to exist,
i) The conductor or a coil ii)The flux iii) The relative motion between conductor and flux.
In a practical generator, the conductor are rotated to cut the magnetic flux, keeping flux stationary. To have a large voltage as the output, the number of conductors are connected
together in a spicific manner, to from a winding. This winding is called armature winding of a d.c. machine. The part on which this winding is kept is called armature of a d.c. machine. To have the rotation of conductors, the conductors placed on the armature are rotated with the help of some external device. Such an external device is called a prime mover. The commonly used prime movers are diesel engines, steam engines, steam turbines, water turbines etc. The necessary manetic flux is produced by current carying winding which is called field winding. The direction of the induced e.m.f. can be obtained by using fleming's right hand rule.
Such an induced e.m.f. which id due to physical movement of coil or conductor with respect to flux or movement of flux with respect to coil or conductor is called dynamically induced e.m.f.
Key Point : So a generating action requires following basic component to exist,
i) The conductor or a coil ii)The flux iii) The relative motion between conductor and flux.
In a practical generator, the conductor are rotated to cut the magnetic flux, keeping flux stationary. To have a large voltage as the output, the number of conductors are connected
together in a spicific manner, to from a winding. This winding is called armature winding of a d.c. machine. The part on which this winding is kept is called armature of a d.c. machine. To have the rotation of conductors, the conductors placed on the armature are rotated with the help of some external device. Such an external device is called a prime mover. The commonly used prime movers are diesel engines, steam engines, steam turbines, water turbines etc. The necessary manetic flux is produced by current carying winding which is called field winding. The direction of the induced e.m.f. can be obtained by using fleming's right hand rule.
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